At Hatteras I used to deflate my 250 down to 19. (You can go down to 10) The other trick is if the wheels start to spin-STOP. Then put your foot on the brake and rev up the motor to the point where you are creeping forward and the brake is keeping the tire from spinning.

And if if it’s anything like the East Coast, have all the needed equipment with you in case the beach police come around.
In Jersey it’s:

1) Fishing equipment and bait and tackle for each person over 12 years of age;
2) Tire gauge;
3) Spare tire;
4) Workable jack and board/support for jack in sand (3/4 in. x 12 x 12 in. plywood square minimum size)
5) Tow chain or ****** line;
6) Shovel;
7) Flashlight;
8) Fire extinguisher;
9) Auto first aid kit;
10) Litter/trash bag;
11) Minimum of 1/4 tank of fuel.

Cool. Just looked at their page. Sounds neat. And it doesn’t look like they have required equipment so you’ll be find. Have fun.